/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraSystem.h
Have we finished loading all the cooked platform data for the target platforms requested in BeginCacheForCookedPlatformData
virtual bool IsCachedCookedPlatformDataLoaded ( const [ITargetPlatform](API\Developer\TargetPlatform\Interfaces\ITargetPlatform) * TargetPlatform )